Note 2 - Securities - Amortized Cost and Estimated Fair Value of Investment Securities by Contractual Maturity (Details) - USD ($) $ in Thousands	Dec. 31, 2025	Dec. 31, 2024
Available-for-Sale, Amortized Cost	$ 295,849	$ 376,265
Investment securities available for sale, at fair value (amortized cost of $295,849 and $376,265, respectively)	270,310	340,344
Collateralized Mortgage-Backed Securities [Member]
Due within one year, amortized cost	4,602	26,690
Due within one year, estimated fair value	4,603	26,509
Due after one through five years, amortized cost	6,912	11,564
Due after one through five years, estimated fair value	6,856	11,539
Due after five through ten years, amortized cost	7,215	8,080
Due after five through ten years, estimated fair value	7,012	7,609
Due after ten years, amortized cost	119,017	140,940
Due after ten years, estimated fair value	106,589	124,656
Available-for-Sale, Amortized Cost	137,746	187,274
Investment securities available for sale, at fair value (amortized cost of $295,849 and $376,265, respectively)	125,060	170,313
Investment Securities, Excluding Mortgage Backed Securities [Member]
Due within one year, amortized cost	1,000	0
Due within one year, estimated fair value	959	0
Due after one through five years, amortized cost	24,082	21,559
Due after one through five years, estimated fair value	23,620	20,751
Due after five through ten years, amortized cost	45,356	58,535
Due after five through ten years, estimated fair value	41,453	53,321
Due after ten years, amortized cost	87,665	108,897
Due after ten years, estimated fair value	79,218	95,959
Total investment securities, amortized cost	158,103	188,991
Total investment securities, estimated fair value	$ 145,250	$ 170,031